Spec first, I have Intel i7 3.40 GHZ, GForce GTX 560 Ti 1GB.
I turned on "Show viewport display time" but I am not sure how to interpret this time. I have 280 ms with all edges on and 80 ms with off. If I converted right than for all adges "on" I have 1000/280=3 FPS and "off" 1000/80=12.5 FPS. (when rotating)

Yes I use this script to hide the edges of the current selected objects every time, but wanted to ask you to improve it a bit.
Would be greate if:
When I select object it will hide all adges on all unselected object. And if I select object with hiden edges it will show them on this object and hide on all unselected objects.

How can I see how much edges have model?

Michael I hide time to time objects that I'm not working on, but i use solo script insted of hide. Becouse when I use hide, when I unhide objecst it unhide them with all hiden edges too.